General form of registration statement for all companies including face-amount certificate companies

Parent Company Financial Information - Summary Of Condensed Statement Of Operation And Comprehensive Loss Income (Detail)

v3.21.2
Parent Company Financial Information - Summary Of Condensed Statement Of Operation And Comprehensive Loss Income (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Condensed Income Statements, Captions [Line Items]      
Net loss $ (158.3) $ (119.1) $ (122.0)
Foreign currency translation, net of tax 34.2 (9.3) (15.1)
Other Comprehensive Income (Loss), Net of Tax 35.1 (9.3) (16.6)
Comprehensive loss attributable to Mirion Technologies (TopCo), Ltd. stockholders $ (123.2) $ (128.4) $ (138.6)
Loss per share—basic and diluted $ (24.18) $ (18.45) $ (19.36)
Weighted average common shares outstanding – basic and diluted 6.549 6.453 6.300
MIRION TECHNOLOGIES LTD [Member] | Parent Company [Member]      
Condensed Income Statements, Captions [Line Items]      
Equity in net loss of subsidiaries $ (158.3) $ (119.1) $ (122.0)
Net loss (158.3) (119.1) (122.0)
Foreign currency translation, net of tax 34.2 (9.3) (15.1)
Unrecognized actuarial gain (loss) and prior service benefit, net of tax 0.9 0.0 (1.5)
Other Comprehensive Income (Loss), Net of Tax 35.1 (9.3) (16.6)
Comprehensive loss attributable to Mirion Technologies (TopCo), Ltd. stockholders $ (123.2) $ (128.4) $ (138.6)
Loss per share—basic and diluted $ (24.18) $ (18.45) $ (19.36)
Weighted average common shares outstanding – basic and diluted 6.549 6.453 6.300